[PATCH] wifi: mt76: mt7925: fix a potential association failure upon resuming

[Mingyen Hsieh]

From: Michael Lo <michael.lo at mediatek.com>

In multi-channel scenarios, the granted channel must be aborted before
suspending. Otherwise, the firmware will be put into a wrong state,
resulting in an association failure after resuming.

With this patch, the granted channel will be aborted before suspending
if necessary.

Cc: stable at vger.kernel.org
Fixes: c948b5da6bbe ("wifi: mt76: mt7925: add Mediatek Wi-Fi7 driver for mt7925 chips")
Signed-off-by: Michael Lo <michael.lo at mediatek.com>
Signed-off-by: Ming Yen Hsieh <mingyen.hsieh at mediatek.com>
---
 drivers/net/wireless/mediatek/mt76/mt7925/main.c  | 15 +++++++++++++++
 .../net/wireless/mediatek/mt76/mt7925/mt7925.h    |  1 +
 drivers/net/wireless/mediatek/mt76/mt7925/pci.c   |  2 ++
 3 files changed, 18 insertions(+)

diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/main.c b/drivers/net/wireless/mediatek/mt76/mt7925/main.c
index 8c0768bf9343..7c05aebd3c20 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7925/main.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7925/main.c
@@ -439,6 +439,19 @@ static void mt7925_roc_iter(void *priv, u8 *mac,
 	mt7925_mcu_abort_roc(phy, &mvif->bss_conf, phy->roc_token_id);
 }
 
+void mt7925_roc_abort_sync(struct mt792x_dev *dev)
+{
+	struct mt792x_phy *phy = &dev->phy;
+
+	del_timer_sync(&phy->roc_timer);
+	cancel_work_sync(&phy->roc_work);
+	if (test_and_clear_bit(MT76_STATE_ROC, &phy->mt76->state))
+		ieee80211_iterate_interfaces(mt76_hw(dev),
+					     IEEE80211_IFACE_ITER_RESUME_ALL,
+					     mt7925_roc_iter, (void *)phy);
+}
+EXPORT_SYMBOL_GPL(mt7925_roc_abort_sync);
+
 void mt7925_roc_work(struct work_struct *work)
 {
 	struct mt792x_phy *phy;
@@ -1109,6 +1122,8 @@ static void mt7925_mac_link_sta_remove(struct mt76_dev *mdev,
 	msta = (struct mt792x_sta *)link_sta->sta->drv_priv;
 	mlink = mt792x_sta_to_link(msta, link_id);
 
+	mt7925_roc_abort_sync(dev);
+
 	mt76_connac_free_pending_tx_skbs(&dev->pm, &mlink->wcid);
 	mt76_connac_pm_wake(&dev->mphy, &dev->pm);
 
diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/mt7925.h b/drivers/net/wireless/mediatek/mt76/mt7925/mt7925.h
index 669f3a079d04..c5ea431998e0 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7925/mt7925.h
+++ b/drivers/net/wireless/mediatek/mt76/mt7925/mt7925.h
@@ -307,6 +307,7 @@ int mt7925_mcu_set_roc(struct mt792x_phy *phy, struct mt792x_bss_conf *mconf,
 		       enum mt7925_roc_req type, u8 token_id);
 int mt7925_mcu_abort_roc(struct mt792x_phy *phy, struct mt792x_bss_conf *mconf,
 			 u8 token_id);
+void mt7925_roc_abort_sync(struct mt792x_dev *dev);
 int mt7925_mcu_fill_message(struct mt76_dev *mdev, struct sk_buff *skb,
 			    int cmd, int *wait_seq);
 int mt7925_mcu_add_key(struct mt76_dev *dev, struct ieee80211_vif *vif,
diff --git a/drivers/net/wireless/mediatek/mt76/mt7925/pci.c b/drivers/net/wireless/mediatek/mt76/mt7925/pci.c
index 6e4f4e78c350..39305c39362f 100644
--- a/drivers/net/wireless/mediatek/mt76/mt7925/pci.c
+++ b/drivers/net/wireless/mediatek/mt76/mt7925/pci.c
@@ -449,6 +449,8 @@ static int mt7925_pci_suspend(struct device *device)
 	cancel_delayed_work_sync(&pm->ps_work);
 	cancel_work_sync(&pm->wake_work);
 
+	mt7925_roc_abort_sync(dev);
+
 	err = mt792x_mcu_drv_pmctrl(dev);
 	if (err < 0)
 		goto restore_suspend;
-- 
2.45.2